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Two conductors are made of the same material and have the same length. Conductor A is a solid wire of diameter 1.0 mm. Conductor B is a hollow tube of outside diameter 4.1 mm and inside diameter 3.1 mm. What is the resistance ratio RA/RB , measured between their ends?
Light of intensity 2.5W/m2 passes through the pupil of one of your eyes and eventually falls on your retina. The radius of the pupil is controlled by the iris.
A spring is hung from a ceiling, and an object attached to its lower end stretches the spring by a distance d = 6.80 cm from its unstretched position when the system is in equilibrium, determine the mass of the object
Water at a gauge pressure of 3.8 atm at street level flows into an office building at a speed of 0.45 m/s through a pipe 4.2 cm in diameter.Calculate the flow velocity in such a pipe on the top floor
In order to view the craters of the Moon, you construct a refracting telescope from a lens with focal length 90.7 cm as its objective and a 11.5-cm focal length lens as its eyepiece
A 20 000 N truck is acted upon by the force that decreases its speed from 10.00 m/s to 5.0 m/s in 5.0 sec. What is the magnitude of force.
During a particular process, the pressure of the gas in a heat engine increases from 1.15×105 Pa to 2.37×105 Pa, What is the work associated with the process
A visitor to a lighthouse wishes to determine the height of the tower. She ties a spool of thread to a small rock to make a simple pendulum, What is the height of the tower
Two stars in a binary system orbit around their center of mass. The centers of the two stars are 7.50 1011 m apart. What is the mass of the smaller star
A uniform disk of mass M=12.0 kg and radius R=.75 m is free to rotate about a frictionless axle through its center. compute the roational kinetic energy
A rotten pumpkin of mass 2.44 kg is dropped from a height of 2-m above the ground. Ignore air friction. Let the positive y-axis point down. How much momentum will the pumpkin have
An object is being acted upon by three forces and moves with a constant velocity. What is the direction of the third force
A small ferryboat is 4.00 m wide and 6.00 m long. When a loaded truck pulls onto it, What is the weight of the truck
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